MC9S12HZ256 Datasheet, PDF (223/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Field
3:0
C[D:A}
Chapter 7 Analog-to-Digital Converter (ATD10B16CV4)
Table 7-14. ATDCTL5 Field Descriptions (continued)
Description
Analog Input Channel Select Code — These bits select the analog input channel(s) whose signals are
sampled and converted to digital codes. Table 7-17 lists the coding used to select the various analog input
channels.
In the case of single channel conversions (MULT = 0), this selection code specified the channel to be examined.
In the case of multiple channel conversions (MULT = 1), this selection code represents the first channel to be
examined in the conversion sequence. Subsequent channels are determined by incrementing the channel
selection code or wrapping around to AN0 (after converting the channel defined by the Wrap Around Channel
Select Bits WRAP[3:0] in ATDCTL0). In case starting with a channel number higher than the one defined by
WRAP[3:0] the first wrap around will be AN15 to AN0.
SRES8
1
1
1
0
0
0
Table 7-15. Available Result Data Formats.
DJM
0
0
1
0
0
1
DSGN
0
1
X
0
1
X
Result Data Formats
Description and Bus Bit Mapping
8-bit / left justified / unsigned — bits 15:8
8-bit / left justified / signed — bits 15:8
8-bit / right justified / unsigned — bits 7:0
10-bit / left justified / unsigned — bits 15:6
10-bit / left justified / signed -— bits 15:6
10-bit / right justified / unsigned — bits 9:0
Table 7-16. Left Justified, Signed and Unsigned ATD Output Codes.
Input Signal
V_RL = 0 Volts
V_RH = 5.12 Volts
5.120 Volts
5.100
5.080
Signed
8-Bit Codes
7F
7F
7E
Unsigned
8-Bit Codes
FF
FF
FE
Signed
Unsigned
10-Bit Codes 10-Bit Codes
7FC0
7F00
7E00
FFC0
FF00
FE00
2.580
2.560
2.540
01
81
0100
8100
00
80
0000
8000
FF
7F
FF00
7F00
0.020
0.000
81
01
8100
0100
80
00
8000
0000
MC9S12HZ256 Data Sheet, Rev. 2.04
Freescale Semiconductor
223